Grinding mill



April 25, 1933.

R. P. JUGEL 1,905,411

GRINDING MILL Filed March 3i, 1950 2 Sheets-Sheet l /8 45 f 34kg i9 /5 7 I .1- j /6 S L Patented Apr. 25, 1933 nuns stares PATENT OFFICE Runonr r. JUGEL, or DENVER, 'ootoaeno, AssIGNoR. ToAMEnIoAN BALL MILL COMPANY GRINDING MILL "Application filed March 31, 1930. Serial No. 440,403.

My invention relates to grinding mills, and particularly to sectional linings for mill heads. A principal object of the invention is to provide such a lining, the sections of whlch are held in place without the useof bolts and nuts. V

Another important obj ect of the invention is to provide a sectional grate adjacent the discharge end to prevent the escape of mate- 1O rial not sufficiently pulverized, but permit the discharge of material that has been reduced to the desired size. o

Other obj ects reside in the provision of simple means for holding the sections in position, which may be quickly released for the removal and replacement of the sections.

A further object of the invention is to provide linings for the trunnions of the mill, which are disposed to assist in holdingothe head sections in position.

Novel combinations and arrangements of parts, and novel details of construction will appear in the course of the following descrips tion. In the drawings like reference char- I acters designate similar parts in the several views. a

Figure 1 is a vertical section of a grinding mill embodying the foregoing objects.

I Figures 2 and 3 are semi-sections looking in the directions of the arrows 22' and 3-3 respectively in Figure 1.

Figures 4 and 5 are sections taken on the lines 44 and 55 respectively in Figure 1. Figure 6 is a face view of a grate section comprised in the invention.

Figure 7 is a face View of an imperforate head section.

Figure 8 is a broken elevation, partly in section, looking in the direction of the arrow A in Figure 1.

Referring more in detail to the drawings, standards 9 are shown for the support of bearings 10 for the mill. The mill has a shell 12 provided with channels 13 and flanges 14. Heads 15 and 16 for the mill are provided with flanges 17 and 18 respectively, which are bolted to the flanges 14 of the shell. A ring gear 19 for driving the mill is bolted to the flange 18.

The heads 15 and 16 have integral trunnions 20 and 22 mounted for rotation in the bearingslO. A feed inlet pipe 21 is bolted to trunnion 20, and a bell flange23 for the discharge of material is bolted to trunnion 22. Supported in the trunnion 20 is a liner 24 containing an internal helical groove 25. The trunnion 22 contains a liner 26having transverse bores 27 The interior of the liner 25 tapers outwardly toward the bell flange 23. A cone 28, disposed opposite the bores '00 27, projects into the liner 26 for guiding mate rial toward the bell flange 23. The shell has a sectional lining, the sections of which are indicated at 29. Wood blocks 30 in the channels "13 and wood blocks 31 between the sections, together hold the shell lining sections 29 in position. These and other features are shownanddescribed more in detail, and are claimed, in my copending application Serial No. 440,404, filed March 31,1930.

The heads 15 and 16 have radial channels 48, and have circumferential flanges or rims 39 and 46 respectively. These flanges are respectively provided with channels 40' and 47 preferably alined with the channels 13 of the shell and continuous with the radial channels 48. The head 15 and the lining therefor are provided withan opening 32 for a manhole. The hole is closed by a plug 35 so to make the lining continuous. The plug has a groove 37 lined with wood, or other compressible and/or expansible'strifps -54. A. cover 33 for the manhole h-asa tongue 36 having a driving fit with the lined groove 5 of the plug. The'cover thereby holds the plug in position. The cover is heldli place by bolts 34 and has handles 38. 1 1 The head 15 has a lining composed of sectors, each of which has a tapering body portion 42 and flanges 43, extending along the longitudinal edges, arranged to fit. inxthe radial channels 48. The'flanges43 haveend portions 44 extending beyond'the end'of the body member.*

As illustrated in Figure 5, the'flangies 43 of the sections project into the radiallyarranged channels 48, and-as shownin Figure 3, the [end portions 44 also project into the channels 40 of the flange 39. Blocks 45 of 10 compressible, expansible material, such as wood, are driven into the channels 48 between the flanges 43 to hold the sections in position. The sections extend from the flange 39 to the trunnion liner 24.

Sections 49 for the head 16 have slots or other apertures 50 to provide grates for the passage therethrough of material. that has of the drum, the flanges 51 on the grate sections lift the material so that it will flow out of the passages 52 and into the outlet trunnion 26 for its discharge through the bell flange 23. p

- It will be noted that the heads 15 and 16 are hollow and the body portions are disposed at angles to the vertical and that the sections of the liners therefor aredisposed at the same angles and have their end faces at obtuse angles to their axes. Moreover, the trunnion liners 24 and 26 project into the mill at least enough to provide a support or rest for the sections. Even though the blocks 45 between the sections become dislodged or broken, the sections will be wedged or lodged in place between the flanges 39 and 46 and the shell lining sections on the one hand and the trunnion liners on the other hand. When in such positions, the sections cannot become dislodge except by shearing off some of the metal of the sections or liners.

In the operation of the mill, material is fed into the'shell by the helical groove in the inlet trunnion liner 24. The grinding medium in'the shell, whether balls, rods or pebbles, pulverizes the material by rotation of the mill. The rotation is eflected by driving means engaging the ring gear 19.

' As the material is reduced to a sufficient fineness, it passes through the slots 50 in the grate sections and into the passages 52. R0- tation of the mill lifts the material and allows it to run out of the passage 52, through the transverse bores 27 and into the outlet conduit 26, from which the material is discharged through the bell fiange 23.

It will be apparent that the sections of the head liners are held in place without the use ofbolts or nuts, and, in fact, will be held in place even though the blocks therebetween are dislodged or broken. It is to be understood that changes may be made in the details? of construction and in the arrangements of pa'rtswithout departing from the spirit of the invention. I do not wish to be limited to the construction and arrangement shown and described, except as specifically stated in the hereunto appended claims.

What I claim and desire to secure by Letters Patent is:

1. In a grinding mill, a shell, a channeled head closing an end of the shell, the head having a channeled flange, and lining sections for the head having flanges in the channels of the head and in the channels of the flange.

2. In a grinding mill, a channeled shell, a head closing an end of the shell and provided with radial channels, the head having a rim provided with channels connecting the channels of the head with those of the shell, and lining sections having flanges in the channels of the head, of the rim and of the shell.

3. In a trunnioned grinding mill, a head therefor, having channels radiating from the trunnion, tapering lining sections for the head having flanges in the channels, and a lining for the trunnion assisting in holding the lining sections in place.

4. In a grinding mill, a channeled head therefor, and a sectional lining for the head, the sections having apertured body portions and flanges, the flanges being in the channels of the head and the body portions being spaced from the head of the mill to provide passages defined by the flanges, the apertures of the body portions connecting the interior of the mill with said passages, and the mill having an outlet connecting with the passages. f

5. In a grinding mill, a channeled head therefor, and a sectional lining for the head, the sections having body portions spaced from the head of the mill to provide passages and having flanges in the channels of the head defining the passages, the mill having an outlet and the passages connecting the interior of the mill with the outlet.

In testimony whereof I hereunto aflix my signature.

' RUDOLF P. JUGEL. 

